Evil Igoe, 34, shot her boyfriend Martyn Barclay in the head at her Edinburgh home in 2009.

The ex-cellmate wrote a rambling and incoherent post on Facebook. Writing as Farrah N Black, she told a friend how Igoe took a line of cocaine in a “wee half wits room” and said she was saving her “subys” for Igoe to take them.

Surprisingly, we also found one inmate complaining about drugs in prison. Robbie Campbell, 22, used a smuggled mobile to complain that prisoners “full ae the blues need to get a grip screamin out windows”.

Campbell is serving nine years for stabbing a cancer sufferer and robbing a schoolboy.

Last month, jail chiefs announced that they have shut down 170 Facebook sites run by inmates on smuggled smartphones since 2010. One in five was run from Addiewell. But our investigation shows prisoners appear to have daily access to Facebook.

On Saturday, we revealed that there were almost 2000 finds of illegal substances in Scotland’s jails last year – more than five a day. The number of seizures has almost doubled in a decade.

Addiewell private jail recorded the highest number of breaches with an astonishing 465 seizures last year, and the number of drugs seizures at Kilmarnock has tripled in the last 10 years.

The overall figure of 1949 finds is up 14 per cent on 2011.

The Record has regularly highlighted the problem of drugs and other contraband in jails.

Last week, we revealed how racist murderer Imran “Baldy” Shahid had bulked up behind bars and vowed to attack his enemies – after he contacted us via a mobile phone sneaked into his cell. Lewis Macdonald, Scottish Labour’s justice spokesman, said: “What kind of message does it send to the victims of crime that prisoners can openly brag about the kind of life they are living behind bars?

“It is time we got serious about taking drugs out of prison and cracked down on the use of mobile phones by prisoners.”

Scottish Tory chief whip John Lamont said: “Prisons are supposed to rehabilitate inmates but with more than five drug finds a day the opposite is happening.”

The prison service said: “Unfortunately, the reality is a large part of the prison population have addictions and drug misuse problems and this continues when they are in jail.”

In January, the new prison service chief executive Colin McConnell sparked controversy by calling for inmates to have phones in their cells.